Method and apparatus for NMR sensor with loop-gap resonator

a loop-gap resonator and nmr sensor technology, which is applied in the direction of reradiation, measurement using nmr, instruments, etc., can solve the problems of increasing the risk of high-tension electric breakdown, affecting the operation of the solenoid antenna, and being subject to wear and deterioration or failur

Inactive Publication Date: 2003-08-14
BAKER HUGHES INC
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Problems solved by technology

Because these sensors are on the outside of the drilling collar, they are exposed to the abrasive rock in the formation during drilling operations and are thus subject to abrasion and wear resulting from particles in the drilling mud and the impact of the sensor against the earth formation during drilling.
The high impedance of the typical NMR antenna raises the voltage amplitude in the typical antenna, thereby raising the

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  • Method and apparatus for NMR sensor with loop-gap resonator
  • Method and apparatus for NMR sensor with loop-gap resonator
  • Method and apparatus for NMR sensor with loop-gap resonator

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[0022] The present invention provides several advantages over the solenoid antennas that have typically been used for NMR tools. The loop-gap resonator of the present invention provides a higher antenna Quality Factor "Q" due to the large cross sectional area of the loop-gap conductor. The loop-gap resonator of the present invention provides a higher degree of homogeneity than a solenoid coil antenna, as the flux lines do not escape loop-gap resonator except at the end of a resonator section. The loop-gap resonator of the present invention provides lower impedance than a typical NMR solenoid antenna, due to the low inductance of the equivalent single winding of the loop-gap resonator. The loop-gap resonator is also mechanically superior, more rugged and more robust than the typical NMR solenoid antenna.

[0023] The loop-gap resonator of the present invention exhibits lower parallel impedance. For transmission purposes, the lower parallel impedance of the loop-gap resonator provides a ...

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Abstract

A loop-gap resonator for providing an excitation pulse in a down hole nuclear magnetic resonating (NMR) tool for determining a parameter of interest in a formation adjacent a borehole. The loop-gap resonator is constructed having one or more capacitive gaps formed in a nonmagnetic conductive loop. The loop-gap resonator may be deployed down a bore in a measurement while drilling (MWD) configuration or in a wire line configuration. The MWD configuration may utilize a non-rotating sleeve rotationally associated with the drill string.

Description

[0001] The following application claims priority from U.S. Provisional Patent Application No. 60 / 356,695 entitled Method and Apparatus for NMR Sensor with Loop-Gap Resonator by Kruspe et al, which was filed on Feb. 14, 2002, which is hereby incorporated herein by reference in its entirety. This application is related to U.S. Pat. No. 6,163,153, by Reiderman et al, entitled Nuclear Magnetic Resonance Pulse Sequence for Optimizing Instrument Electrical Power Usage which is hereby incorporated herein by reference in its entirety.[0002] 1. Field of the Invention[0003] This invention relates to a NMR tool having a loop-gap resonator sensor for radio frequency generation and reception of NMR signals in zone of interest in a hydrocarbon bearing formation adjacent a borehole during measurement-while-drilling (MWD) or wire line operations down hole.[0004] 2. Description of the Related Art[0005] To obtain hydrocarbons such as oil and gas, a drilling assembly (also referred to as the "bottom h...

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Application Information

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IPC IPC(8): G01R33/343G01R33/44G01V3/32
CPCG01N24/081G01V3/32G01R33/343
Inventor KRUSPE, THOMASBLANZ, MARTINROTTENGATTER, PETER
Owner BAKER HUGHES INC
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